Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 920, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac2251
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Funding
- National Natural Science Foundation of China [NSFC-11833007, 12103048, 118223 01, 12073025, 12003001]
- Fundamental Research Funds for the Central Universities
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GSN 069 is an ultra-soft X-ray active galactic nucleus that has recently shown X-ray quasi-periodic eruptions. Through analysis of nitrogen and carbon line ratios, the [C/N] abundance of GSN 069 has been constrained. It is suggested that the partial disruption of a red giant star and the surviving core orbiting the black hole may explain the observed phenomena.
GSN 069 is an ultra-soft X-ray active galactic nucleus that previously exhibited a huge X-ray outburst and a subsequent long-term decay. It has recently presented X-ray quasi-periodic eruptions (QPEs). We report the detection of strong nitrogen lines but weak or undetectable carbon lines in its far-ultraviolet spectrum. With a detailed photoionization model, we use the C iv/N iv] ratio and other ratios between nitrogen lines to constrain the [C/N] abundance of GSN 069 to be from -3.33 to -1.91. We argue that a partially disrupted red giant star can naturally explain the abnormal C/N abundance in the UV spectrum, while the surviving core orbiting the black hole might produce the QPEs.
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